
plot_theme <- theme_bw() + 
  theme(legend.title = element_blank(), 
        legend.background = element_blank(),
        legend.text = element_text(size=12), 
        axis.title.x=element_text(size=14,face="bold", margin = margin(t=10)), 
        axis.title.y=element_text(size=14,face="bold", margin = margin(r=10)), 
        axis.text = element_text(size=12), 
        legend.key = element_blank()) 